What is a Magnetic Field Generator?

Magnetic Field Generators are used in EMC immunity testing to evaluate the susceptibility of electronic equipment to magnetic field disturbances, particularly at low frequencies. These tests are defined in standards such as IEC 61000-4-8 for power frequency magnetic fields and IEC 61000-4-9 for pulsed magnetic fields. The systems generate controlled magnetic fields using specialized coils, such as Helmholtz coils or single-axis and three-axis loop configurations, to create a uniform field within the test volume.

Key performance parameters of Magnetic Field Generators include field strength, frequency range, waveform type, and field uniformity. These systems are capable of generating magnetic field strengths from a few amperes per meter up to several kiloamperes per meter, depending on the test requirement. Frequency ranges typically cover DC and low-frequency operation, including power line frequencies such as 50 Hz and 60 Hz, as well as pulsed and transient magnetic field conditions. Maintaining uniform field distribution within the test area is critical for ensuring consistent and repeatable test results.

Modern Magnetic Field Generators incorporate precision current sources, control electronics, and feedback mechanisms to ensure accurate field generation and stability. Closed-loop control using magnetic field probes allows real-time monitoring and adjustment of the generated field. Many systems include programmable test sequences, automated control, and integration with EMC test software to streamline testing procedures. Modular coil designs and configurable setups allow flexibility in accommodating different test sample sizes and standards requirements.

Magnetic Field Generators are used in EMC compliance testing, automotive electronics validation, aerospace and defense systems testing, industrial equipment certification, and medical device evaluation. They are typically deployed in laboratory environments where controlled magnetic field exposure is required. These systems support the assessment of equipment performance under magnetic disturbances, helping ensure reliable operation in real-world electromagnetic environments.

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